B.must have been C.should be
D.should have 答案 B 【例31】 —Do you know what Tom is doing at the crossroads? —He ________ for his girlfriend. A.should wait
B.must be waiting C.can have waited
D.might waiting 答案 B 2.can / could多用于否定句或疑问句中,二者一般没有时间上的差异,只是could的语气更客气委婉。can't/couldn't意为“不可能”。 【例32】 I'm afraid Mr.Harding ________ see you now.He's busy.
(2010·全国Ⅱ) A.can't
B.mustn't C.shouldn't
D.needn't 答案 A 【例33】 —There were already five people in the car but they managed to take me as well. —It ________ a comfortable journey. A.can't be
B.shouldn't be C.mustn't have been
D.couldn't have been 答案 D 【例34】 The World Wide Web is sometimes jokingly called the World Wide Wait because it ________ be very slow. A.should
B.must
C.will
D.can 答案 D 3.may / might用于肯定句或否定句中,might不是may的过去式,只是might的可能性比may小。may not / mightn't意为“可能不”。 【例35】 Peter ________ come with us tonight, but he isn't very sure yet. A.must
B.may
C.can
D.will 答案 B 【例36】 —Is John coming by train? —He should, but he ________ not.He likes driving his car. A.must
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